At first glance, these limes look like a normal shipment of the green fruit. But they don’t contain the citrus juice you would squeeze into your margarita on a hot summer day.

Instead the phony limes were packed full of marijuana. US Customs and Border Protection officers in Pharr, Texas, seized a total of 3,947 pounds of weed in the commercial shipment of key limes on January 30, officials said.

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The truck hauling the “produce” crossed the Pharr-Reynosa International Bridge along the Texas-Mexico border near the Gulf of Mexico. Over 34,000 of the fake fruit packages were discovered by an imaging inspection system and narcotics K-9 team.

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“This is an outstanding interception of narcotics. Our CBP officers continue to excel in their knowledge of smuggling techniques, which allows them to intercept these kinds of attempts to introduce narcotics into our country,” said Port Director Efrain Solis Jr. in a statement.